Activities that require repeated bending and straightening of the elbow, or any repetitive movements that cause stress injuries to the elbow, are common causes of ulnar nerve entrapment. The condition can also develop due to fluid buildup, arthritis, or swelling in the wrist joint or elbow. Bone spurs can cause entrapment, as can leaning on the elbow for extended periods of time, or sleeping with the arms folded. Fractures, dislocations, or direct trauma may contribute as well. Sports such as badminton or tennis, or work duties that require repetitive motions or excessive gripping, can also lead to ulnar nerve entrapment.
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